US6752825B2 - Nested stent apparatus - Google Patents
Nested stent apparatus Download PDFInfo
- Publication number
- US6752825B2 US6752825B2 US09/969,967 US96996701A US6752825B2 US 6752825 B2 US6752825 B2 US 6752825B2 US 96996701 A US96996701 A US 96996701A US 6752825 B2 US6752825 B2 US 6752825B2
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- Prior art keywords
- stent
- stents
- catheter
- sheath
- desired location
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- Expired - Fee Related, expires
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Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/852—Two or more distinct overlapping stents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
Definitions
- This invention relates to implantable medical devices and delivery systems for delivering such medical devices into a body lumen.
- PTCA Percutaneous transluminal coronary angioplasty
- the most widely used form of percutaneous coronary angioplasty makes use of a dilatation balloon catheter which is introduced into and advanced through a lumen or body vessel until the distal end thereof is at a desired location in the vasculature.
- the expandable portion of the catheter, or balloon Once in position across a lesion site, the expandable portion of the catheter, or balloon, is inflated to a predetermined size with a fluid at relatively high pressures, to radially compress the atherosclerotic plaque of the lesion against the inside of the artery wall and thereby dilate the lumen of the artery.
- the balloon is then deflated to a small profile so that the dilatation catheter may be withdrawn from the patients vasculature and blood flow resumed through the dilated artery.
- angioplasty procedures of the kind described above, there may be restenosis of the artery, which either necessitates another angioplasty procedure, a surgical by-pass operation, or some method of repairing or strengthening the area.
- a physician can implant an intravascular prosthesis for maintaining vascular patency, such as a stent, inside the artery at the lesion.
- a stent is a generally cylindrical prosthesis introduced via a catheter into a lumen of a body vessel in a configuration having a generally reduced diameter and then expanded to the diameter of the vessel.
- the stent may be self-expanding, such as a nitinol shape memory stent, or it may be expandable by means of an inflatable portion of the catheter, such as a balloon. In its expanded configuration, the stent supports and reinforces the vessel walls while maintaining the vessel in an open, unobstructed condition.
- a bifurcated stent and/or graft typically comprises a tubular body or trunk and two tubular legs. Examples of bifurcated stents are shown in U.S. Pat. No. 5,723,004 to Dereume et al., U.S. Pat. No. 4,994,071 to MacGregor, and U.S. Pat. No. 5,755,735 to Richter, et al.
- Bifurcated stents such as described above are often more bulky than a cylindrical stent having no branches.
- the delivery systems for use with bifurcated stents are likewise often more bulky than many of those systems for use in delivering branchless cylindrical stents.
- the delivery systems for such branchless cylindrical stents may also be somewhat less complex than those utilized with bifurcated stents.
- a single branchless cylindrical stent may be unsuited for treatment of bifurcation. It would be preferable to utilize multiple cylindrical stents that could be placed in and around a bifurcation site to effectively form a stent assembly which functions similarly to a single bifurcated stent. While use of such multiple stent assemblies would avoid the problems associated with bifurcated stents and delivery systems, delivery of multiple stents to a site within the body could be a difficult undertaking requiring several catheters to be sequentially advanced through a vessel or vessels, in order to place each stent at or around the bifurcation. Moreover, by advancing multiple catheters through the body the risk of damaging the vessel(s) through which each of the delivery catheters is advanced is inherently increased.
- a stent assembly comprises at least two stents for delivery into one or more predetermined locations in a body lumen, such as a bifurcation of a vessel and surrounding area.
- the stent assembly may be disposed about a portion of a delivery catheter in an at least partially overlapping configuration. Between each stent may be positioned one or more retractable sheaths or sleeves. The outer most stent may also have a retractable sleeve disposed thereabout.
- the unique configuration of stents and retractable sleeves provides for the ability to utilize a single catheter to deliver multiple stents to one or more locations in a body lumen.
- a stent delivery catheter for which comprises an inner member having a first stent disposed thereabout and a second stent disposed about the first stent.
- the catheter further comprises a first sheath between the first stent and the second stent and may have a second sheath disposed about the second stent.
- the catheter may be configured to deliver stents of any type including self-expandable and balloon expandable stents.
- the catheter may be further configured to deliver more than two stents and sheaths.
- the catheter may be used to deliver stents of different types as well as different sizes.
- a method of treating a body comprises the steps of providing a catheter comprising a plurality of stents including a first stent and a second stent, the first stent extending within the second stent; inserting the catheter in a bodily vessel and delivering the stents to a first desired location within the body; deploying one of the first and second stents at the first desired location; delivering the other of the first and second stents to a second desired location within the body, the second desired location different than the first desired location; deploying the other of the first and second stents at the second desired location.
- FIG. 1 is a side elevational view of an embodiment of the invention
- FIG. 2 is a side elevational view of another embodiment of the invention.
- FIG. 3 is a side elevational view of another embodiment of the invention.
- FIG. 4 is a side elevational view of another embodiment of the invention.
- FIG. 5 is a side elevational view of another embodiment of the invention.
- FIG. 6 is a side elevational view of yet another embodiment of the invention.
- the inventive catheters are intended for use in delivering deployable medical devices to a desired location in the body.
- the medical devices are of the radially expandable tubular type.
- Particularly suitable radially expandable tubular medical devices for use with the inventive catheter include stents, stent-grafts, grafts, vena cava filters and other intraluminal and interluminal prostheses.
- the devices may be self-expanding or mechanically expandable via balloons or other expansion devices.
- the term ‘stent’ as used henceforth shall be understood to refer to all such radially expandable tubular medical devices.
- the inventive medical device delivery catheter in general and stent delivery catheter in particular, may be used for performing one or more intraluminal procedures on a patient as part of a therapeutic treatment.
- intraluminal it is meant that the procedures occur at a target site within a body lumen. Typically, the procedure will occur within a portion of the patient vasculature such as, for example, the arterial system. More particularly, the inventive catheter will find use in the coronary arteries, the peripheral arteries and the cerebral arteries.
- the catheters of the present invention are not limited to use in the vascular system and may also be advantageously employed in other body structures, including the prostate via the prostatic urethra, (e.g., to treat benign prostatic hypertrophy (BPH), or adenocarcinoma), the fallopian tube via its lumen (to treat strictures), brain parenchyma (to treat Parkinson's disease), and the like.
- BPH benign prostatic hypertrophy
- adenocarcinoma e.g., to treat benign prostatic hypertrophy (BPH), or adenocarcinoma
- the fallopian tube via its lumen to treat strictures
- brain parenchyma to treat Parkinson's disease
- the delivery system may comprise a catheter assembly, indicated generally at 10 .
- Catheter 10 includes a distal region 12 which as a plurality of stents disposed thereabout.
- an inner or first stent 14 is disposed about the distal region 12 .
- the first stent 14 is held in place prior to delivery by a first retractable sheath or sleeve 16 which at least partially overlies first stent 14 at the distal region 12 .
- a second stent 18 Disposed about the first stent 14 and first sheath 16 is a second stent 18 which is held in place prior to delivery by a second retractable sheath 20 .
- Retractable sheaths 16 and 20 extend proximally to the proximal region of the catheter 10 where each of the sheathes 16 and 20 may be proximally retracted.
- the outer most sheath 20 must first be retracted to expose stent 18 .
- Stent 18 may then be expanded to a delivery diameter. Once the outermost sheath has been retracted and the immediately underlying stent is expanded, the next innermost sheath, such as sheath 16 may be retracted and the underlying stent 14 may be expanded.
- stents 14 and 18 may be self-expanding stents constructed from a shape memory metal such as nitinol or other material such as a shape memory polymer material.
- a shape memory metal such as nitinol or other material such as a shape memory polymer material.
- a balloon expandable stent is included for delivery by catheter 10
- a portion of the distal end 12 of the catheter 10 may be equipped with a medical balloon 22 such as is shown in FIG. 2 .
- catheter 10 includes a balloon 22
- the catheter includes a proximally extending inflation lumen 24 which is in fluid communication with the balloon 22 in order to provide inflation fluid to the balloon interior as is know in the art.
- balloon 22 may be used to further mechanically expand or seat the stents into place once they are fully self-expanded.
- inner stent 14 may be a balloon expandable stent which may be expanded to its delivery diameter through inflation of balloon 22 .
- Expansion of such a balloon expandable stent will typically occur after delivery of any outer stents, such as stent 18 , and retraction of sheathes, such as sheathes 16 and 20 .
- outer stents such as stent 18
- sheathes such as sheathes 16 and 20
- the balloon may be used to further expand or seat self-expanding stent 18 .
- stents 14 and 18 a have the same structural properties or characteristics.
- the stents may also be configured to have different shapes, sizes, strut patterns etc.
- one of the stents such as for example stent 18 , may have a greater length than the other stent 14 .
- Stents of differing lengths may be useful for treating multiple legions of unequal lengths in a vessel or vessel branches.
- outer stent 18 is shown as being longer than inner stent 14 . It should be noted however, that any stent used with catheter 10 may be provided with a desired length independent of the length of the remaining stents. Relative radial position on the catheter of a stent of a given length may likewise be varied. That is to say: where it is desired to provide one or more stents with a length greater than other stents, the longer stents may be radially inward or outward of the shorter stents as desired.
- the position of the stents 14 and 18 may also be varied longitudinally as well.
- the distal end 26 of stent 18 is shown overlapping only a proximal portion 28 of the inner stent 14 .
- the stents of the present invention may overlap to any degree and in any configuration, however, partial overlap of the stents may provides a reduction of the length of the least flexible cross-section as well as the largest diameter of the combined stents 14 and 18 .
- stents which may be associated with the catheter 10 .
- the catheter assembly 10 is shown having only two stents 14 and 18 positioned thereon.
- the catheter is shown equipped with three partially overlapping stents 14 , 18 , and 28 .
- Stent 28 also include a retaining sheath 30 which has the same characteristics and function as sheathes 16 and 20 previously described.
- the stents may have a variety of characteristics such as size, shape, construction, expansion characteristics, etc. such as has been previously described in relation to FIGS. 1-4.
- characteristics such as size, shape, construction, expansion characteristics, etc.
- FIG. 5 One of ordinary skill in the art will recognize that the particular overlapping configuration of stents 14 , 18 , and 28 shown in FIG. 5 is merely one example of a wide variety of configurations of the catheter assembly 10 and that other configurations of stents of the same or different size, shape, construction, and expansion types may be employed with the present invention.
- a variety of sheathes or sleeves may also be utilized to cover or retain the stents in the reduced state prior to delivery.
- proximally retractable sheathes 16 and 20 are shown (in FIG. 5, proximally retractable sheath 30 is also shown).
- alternative forms of sheathes such as self-retracting sleeves 40 and 42 , examples of which are shown in FIG. 6 .
- Self-retracting sleeves 40 and 42 are particularly useful in retaining a balloon expandable stent, such as stent 14 , in place about the balloon 22 prior to delivery of the stent 14 .
- sleeves 40 and 42 An example of sleeves 40 and 42 is described in U.S. Pat. No. 4,950,227 to Savin et al., which relates to a balloon expandable stent delivery system in which a sleeve overlaps the distal or proximal margin (or both) of a stent during delivery. During inflation of the stent at the deployment site, the stent margins are freed of the protective sleeve(s) and the sleeve(s) then collapse upon the delivery catheter for removal.
- sleeves 40 and 42 have ends 44 which are engaged to portions of the catheter adjacent to the balloon 22 .
- the sleeves 40 and 42 extend from ends 44 over at least a portion of stent 14 end terminate in end 46 .
- the sleeves 40 and 42 may extend over the entire length of the stent 14 and may even abut or engage one another prior to stent delivery. Examples of sleeves which engage one another are described in U.S. app. Ser. No. 09/552807 filed Apr. 20, 2000 and entitled Fully Sheathed Balloon Expandable Stent Delivery System, the entire contents of which is incorporated herein by reference.
- outer sheath(es), such as sheath 20 must first be retracted to allow self-expanding stents, such as stent 18 to expand outward from the catheter.
- balloon 22 may be inflated to cause sleeves 40 and 42 to retract and allow stent 14 to be expanded and delivered.
- the sleeves 40 and 42 may be configured to remain on the ends of the balloon to aid in balloon collapse and removal of the catheter 10 from the body. Alternatively, the sleeves may retract fully off of the balloon 22 or may be biodegradable. Where the sleeves 40 and 42 are biodegradable the stent 14 may be a self-expanding stent with no need for balloon expansion.
- any dependent claim which follows should be taken as alternatively written in a multiple dependent form from all prior claims which possess all antecedents referenced in such dependent claim if such multiple dependent format is an accepted format within the jurisdiction (e.g. each claim depending directly from claim 1 should be alternatively taken as depending from all previous claims).
- each claim depending directly from claim 1 should be alternatively taken as depending from all previous claims.
- the following dependent claims should each be also taken as alternatively written in each singly dependent claim format which creates a dependency from a prior antecedent-possessing claim other than the specific claim listed in such dependent claim below.
Abstract
Description
Claims (16)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/969,967 US6752825B2 (en) | 2001-10-02 | 2001-10-02 | Nested stent apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US09/969,967 US6752825B2 (en) | 2001-10-02 | 2001-10-02 | Nested stent apparatus |
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US20030065375A1 US20030065375A1 (en) | 2003-04-03 |
US6752825B2 true US6752825B2 (en) | 2004-06-22 |
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US09/969,967 Expired - Fee Related US6752825B2 (en) | 2001-10-02 | 2001-10-02 | Nested stent apparatus |
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Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
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US20010044650A1 (en) * | 2001-01-12 | 2001-11-22 | Simso Eric J. | Stent for in-stent restenosis |
US20040093056A1 (en) * | 2002-10-26 | 2004-05-13 | Johnson Lianw M. | Medical appliance delivery apparatus and method of use |
US20040193243A1 (en) * | 2003-03-31 | 2004-09-30 | Mangiardi Eric K. | Medical appliance optical delivery and deployment apparatus and method |
US20050010138A1 (en) * | 2003-07-11 | 2005-01-13 | Mangiardi Eric K. | Lumen-measuring devices and method |
US20060217759A1 (en) * | 2003-08-07 | 2006-09-28 | Jason Reynolds | Therapeutic medical appliance delivery and method of use |
US20070067013A1 (en) * | 2005-09-16 | 2007-03-22 | Wilson-Cook Medical Inc., D/B/A/ Cook Endoscopy | Double metal stent introducer |
US20070282421A1 (en) * | 2006-05-31 | 2007-12-06 | Parker Fred T | Stent Assembly for Protecting the Interior Surface of a Vessel |
US20080082159A1 (en) * | 2006-09-28 | 2008-04-03 | Cook Incorporated | Stent for Endovascular Procedures |
US7785360B2 (en) | 2001-09-28 | 2010-08-31 | Merit Medical Systems, Inc. | Instrument for implanting vascular prostheses |
US20110029082A1 (en) * | 2008-03-14 | 2011-02-03 | Synthes Usa, Llc | Nested expandable sleeve implant |
US8043366B2 (en) | 2005-09-08 | 2011-10-25 | Boston Scientific Scimed, Inc. | Overlapping stent |
US8353946B2 (en) | 2003-05-01 | 2013-01-15 | Merit Medical Systems, Inc. | Bifurcated medical appliance delivery apparatus and method |
US8398672B2 (en) | 2003-11-12 | 2013-03-19 | Nitinol Devices And Components, Inc. | Method for anchoring a medical device |
US9649211B2 (en) | 2009-11-04 | 2017-05-16 | Confluent Medical Technologies, Inc. | Alternating circumferential bridge stent design and methods for use thereof |
US10092427B2 (en) | 2009-11-04 | 2018-10-09 | Confluent Medical Technologies, Inc. | Alternating circumferential bridge stent design and methods for use thereof |
US10335296B2 (en) | 2011-05-17 | 2019-07-02 | The University Of Kentucky Research Foundation | Graft within a graft endoluminal graft |
US11185403B2 (en) | 2011-08-31 | 2021-11-30 | Cook Medical Technologies Llc | Endoluminal prosthesis assembly |
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US7771463B2 (en) | 2003-03-26 | 2010-08-10 | Ton Dai T | Twist-down implant delivery technologies |
AU2004226464A1 (en) * | 2003-03-26 | 2004-10-14 | Cardiomind, Inc. | Implant delivery technologies |
US20040193178A1 (en) * | 2003-03-26 | 2004-09-30 | Cardiomind, Inc. | Multiple joint implant delivery systems for sequentially-controlled implant deployment |
US7651521B2 (en) * | 2004-03-02 | 2010-01-26 | Cardiomind, Inc. | Corewire actuated delivery system with fixed distal stent-carrying extension |
US20050209670A1 (en) * | 2004-03-02 | 2005-09-22 | Cardiomind, Inc. | Stent delivery system with diameter adaptive restraint |
US20070073379A1 (en) * | 2005-09-29 | 2007-03-29 | Chang Jean C | Stent delivery system |
US20070055339A1 (en) * | 2005-08-23 | 2007-03-08 | George William R | Staged stent delivery systems |
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US7771465B2 (en) * | 2006-06-23 | 2010-08-10 | Gore Enterprise Holdings, Inc. | Branched stent delivery system |
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US10028747B2 (en) | 2008-05-01 | 2018-07-24 | Aneuclose Llc | Coils with a series of proximally-and-distally-connected loops for occluding a cerebral aneurysm |
US8657870B2 (en) | 2009-06-26 | 2014-02-25 | Biosensors International Group, Ltd. | Implant delivery apparatus and methods with electrolytic release |
US8491646B2 (en) * | 2009-07-15 | 2013-07-23 | Endologix, Inc. | Stent graft |
US9358140B1 (en) | 2009-11-18 | 2016-06-07 | Aneuclose Llc | Stent with outer member to embolize an aneurysm |
US8465541B2 (en) * | 2010-04-19 | 2013-06-18 | Medtronic, Inc. | Transcatheter prosthetic heart valve delivery system and method with expandable stability tube |
US9907684B2 (en) | 2013-05-08 | 2018-03-06 | Aneuclose Llc | Method of radially-asymmetric stent expansion |
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